Why does Gemini show 0% or "stale"?

This can happen if you're signed into more than one Google account — Gemini uses a separate address for each one, and MyQuota can briefly target the wrong one. It corrects itself automatically the next time you open a Gemini tab.

How Google accounts work with Gemini

Google scopes Gemini separately per signed-in account, and MyQuota follows whichever account you most recently had a Gemini page open on. If your subscription is on one account but you were last browsing Gemini on another, the figures follow the account you visited, not the one paying.

Open Gemini on the account you want tracked, then refresh. There is no way to pin an account explicitly yet. See what MyQuota tracks for Gemini on its own page.